The alleged threat, which federal authorities could not confirm as authentic at the time, was believed to come from ruling party leader Diosdado Cabello, with whom Rubio has publicly feuded.

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An assassination threat against Sen. Marco Rubio is believed to have stemmed from Venezuelan leader Diosdado Cabello.
(REUTERS/Marco Bello)

The Miami Herald reported that in a Homeland Security Department memo, it was revealed that Cabello did “order to have Senator Rubio assassinated,” though “no specific information regarding an assassination plot against Senator Rubio has been garnered thus far.”

U.S. Capitol security forces had planned to "beef up" protections for lawmakers following the shooting of House Majority Whip Steve Scalise, who was wounded on June 14 as Republican lawmakers practiced for the annual Congressional baseball game.